In two separate orders, Sebi has suspended certification of registration of Deepak C Dalal and Krishvi Securities P Ltd for a period of 15 days.

These orders would come into force on expiry of 21 days from today, Sebi said.

The case relates to alleged irregularities in the shares of Temptation Foods, Bang Overseas, Cals Refineries and two other companies during August 2007 and February 2009.

According to Sebi, artificial volumes in these scrips were created through the manipulative and fraudulent trades of the 'connected clients' with active involvement and aiding/ abetting of the these stock brokers.

Further, it said the stock brokers failed to exercise due diligence and assisted some of the 'connected clients' while dealing in the scrips of five companies.